Crossword Genius

There's inevitability in the way it crumbles (6)

Ross

I believe the answer is:

cookie

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'it crumbles' is the definition.
The definition suggests a singular noun which matches the answer.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for cookie that I've seen before include "Computing identifier; biscuit (American)" , "that sits on computer" , "Piece of computer data" , "US bicky" , "Identifying data; biscuit" .)

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